Auxiliary heating attachment for furnaces



Jul 3", 1928. 1,675,384

' W. SCHAU AUXILIARY HEATING ATTACHMENT FOR FURNACES Filed Jan. 31/ 1927IN ENTOR. W j g,

ATTORNEY.

Patented July 3, 1 928.

WILLIAM SCHAU, 0F KALAMAZOO, MICHIGAN.

AUXILIARY HEATING ATTACHMENT FOR FURNACES.

Applieation flled January ,31, 1927. Serial No. 164,828.

This invention relates to new and useful improvements in an auxiliaryheating attachment for furnaces.

One object of the invention is to provide an auxiliary heatingattachment for hot air furnaces whereby the heat from the hot air andsmoke passing from the furnace to the smoke stack, or smoke utilized.

Another object of the invention is to provide a furnace attachment ofthe character described embodying an air inlet pipe for admittingoutside air and passing the same around the smoke pipe or flue anddischarg- 5 mg the same into the room or building to be heated, with adamper for controlling said air inlet pipe.

With the above and other objects in View this invention has particularrelation to cer tain novel features of construction, operation andarrangement of parts, an example of which is given in this specificationand illustrated in the accompanying drawing, wherein j The figure showsa vertical sectional view of the apparatus, as applied to a hot airfurnace.

Referring now more particularly to the drawing, the numeral 1 designatesa hot air furnace, as a whole. The main hot air pipes through which theheated air may be distributed throughout the building have not beenshown, as they are in common use, and their construction and arrangementare well known and they form no part of this invention.

The numeral 2 designates the smoke stack, or smoke flue, through whichthe smoke is ultimately discharge The numeral 3 designates an outerdrum, or jacket having the annular end plates 4, 4, and within andspaced from the walls of this jacket, with. its ends anchored. to therespective end plates 4 and concentric there with, there is an innerdrum 5 forming an air circulating chamber 6 between said drums. Theinner drum connected into the main smoke flue 2 through the connect ingpipe 7, through the wall of the flue 2 and the other end of which isanchored to the adjacent end plate 4 of the drum 3.

Leading from the combustion chamber of the furnace 1 there is asmokepipe 8 which,

connects into the end of the inner drum 5 reniiote from the smoke stack2, and this pipe 1 which is spaced outlet flue may be ment 14 w i Theheat from the hot out from the furnace through the smoke one end ofwhich projects,

8 is surrounded and enclosed by a jacket 9 away from said pipe and whichenters the corresponding end of the air chamber 6, and leading out fromsaid air chamber 6 and entering the room or building to be warmed thereis a hot air delivery pipe 10. Leading in from the free air there is anair inlet pipe 11 which enters the other end of the chamber 6 andleading therefrom there is a branch pipe 12 which is connected into thejacket 9.

The end plates 4, 4, have the pulleys as 13, attached thereto and thereis a damper controlling element designated generally by the numeral 14which is connected, at one end, to one of the end plates 4, at the point15, and this element is located in the inner drum 5 and is threadedaround 13 and its other end is extended flexible and works over a ries awei ht 17.

and formed pulley 16 and car- The sections of the eleich work around thepulleys 13 are flexible, as at 18, and between these flexible sectionssaid element may be formed of metal rods'which are responsive to varyingtem eratures.

T e air inlet pipe 11 has withinit a downwardly opening damper 19 towhich the depending end of theelement I4 is attached.

When the damper 19 is open free air will enter through the pipe 11 partof which will enter one end of the chamber 6 directly from said pipe'audthe remainder of said air will pass through the branch pipe 12 and thejacket 9 and will enter the other end of said chamber 6. The warmed bythe smoke pipe 8 and the inner drum 5 and will pass thence through thedelivery pipe 10 into the room to be heated. air and smoke passing stackwill, in a measure thus be conserved.

The length of the element 14 will vary in accordance with thetemperature, within the inner drum 5. When the air passing from thefurnace through this drum is hot the element 14 will be extendedpermitting the weight 17 to open the damper 19, but as the temperaturein said drum lowers, said element will contract, corresponding] closingsaid damper, to the end that air Wlll be ad mitted only when the drum 5is hot enough to heat the air passing around it into the room to beheated and will be shut off when the drum 5 has not sufficienttemperature to heat the lDflDWlIlg air.

the pulleys air so entering will be inletpipe chamber of the furnace andconnected into the innerrdrum, a jacket surrounding and spaced from saidsmoke pipe and entering one end of said chamber, an air inlet pipeconnectedinto the other end of said chamber, a branch pipe leading fromsaid air and connected" into said jacket.

In testimony whereof I have signed my 11 ELIIIG.

WILLIAM SCHAU.

